MIPS: Remove addinitrd and CONFIG_PROBE_INITRD_HEADER

Addinitrd has been superseded by initramfs ages ago.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --cc arch/mips/Kconfig
Simple merge

diff --cc arch/mips/boot/Makefile
Simple merge

diff --cc arch/mips/boot/addinitrd.c
Simple merge

diff --cc arch/mips/configs/ar7_defconfig
Simple merge

diff --cc arch/mips/configs/cavium-octeon_defconfig
Simple merge

diff --cc arch/mips/configs/rbtx49xx_defconfig
Simple merge

diff --cc arch/mips/kernel/setup.c
Simple merge